Chevrolet 1977 10 Series, Repair Manual, Page: 336 / 468

(400)7A-16
OVERHAUL MANUAL
Fig. 7 A - 5 6 C -- ln s t a ll in g Steel S p e e d o m e t e r Drive Gear
2. Install new steel speedometer drive gear and drive to
location (5-43/64" below end of output shaft for all models
except CA, CG and CR) (11-15/64" below end of output
shaft for model CA) (11-29/64 below end of output shaft for
models CG and CR) using J-5590 (Fig. 7A-56C).
GOVERNOR ASSEMBLY
All com ponents of governor assembly, with exception
of driven gear, are a select fit and each assembly is calibrated.
The governor, including the driven gear, is serviced as a
complete assembly. However, the driven gear can also be
serviced separately.
It is necessary to disassemble governor assembly in order
to replace driven gear. Disassembly may also be necessary
Fig. 7A-57C--Governor~Exploded
Fig. 7 A - 5 8 C -- C h e c k in g V a lv e O p e n in g W i t h W e ig h t s O u t w a rd
due to foreign m aterial causing im proper operation. In such
cases, proceed as follows:
Disassembly
1. Cut off one end of each governor weight pin and
remove pins, governor thrust cap, governor weights, and
springs. G overnor weights are interchangeable from side to
side and need not be identified. (Fig. 7A-57C).
2. Remove governor valve from governor sleeve. Be
careful not to damage valve.
3. Perform following inspections and replace governor
driven gear, if necessary.
Inspection
1. Wash all parts in cleaning solvent, air dry and blow
out all passages.
2. Inspect governor sleeve for nicks, burrs, scoring or
galling.
3. Check governor sleeve for free operation in bore of
transmission case.
4. Inspect governor valve for nicks, burrs, scoring or
galling.
5. Check governor valve for free operation in bore of
governor sleeve.
6. Inspect governor driven gear for nicks, burrs, or
damage.
7. Check governor driven gear for looseness on governor
sleeve.
8. Inspect governor weight springs for distortion or
damage.
9. Check governor weights for free operation in their
retainers.
10. Check valve operating at entry (.020" minimum)
with a feeler gage, holding governor as shown with governor
weights extended completely outw ard (Fig. 7A-58C).